Comparison of two configurations of a four-reflector beam-waveguide for a large space communication facility

In this paper we perform full-wave two-dimensional (2-D) simulation and performance comparison of the E-polarized beam wave guidance and scattering by two variations of a typical fragment of quasioptical feeding circuit of a deep-space communication antenna. The fragments are similar and consist of a chain of four finite-size reflectors and mirrors with varied position of the second pair. The feed beam generated by the aperture of a corrugated horn is simulated with the incident complex-source-point (CSP) field. Numerical solution is obtained from the coupled singular integral equations (IEs) discretized using new quadrature formulas of interpolation type that take full account of the IE kernel singularity and the edge behaviour.